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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / spdx-expression-parse / README.md

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-This package parses [SPDX license expression](https://spdx.org/spdx-specification-21-web-version#h.jxpfx0ykyb60) strings describing license terms, like [package.json license strings](https://docs.npmjs.com/files/package.json#license), into consistently structured ECMAScript objects.  The npm command-line interface depends on this package, as do many automatic license-audit tools.
-
-In a nutshell:
-
-```javascript
-var parse = require('spdx-expression-parse')
-var assert = require('assert')
-
-assert.deepEqual(
-  // Licensed under the terms of the Two-Clause BSD License.
-  parse('BSD-2-Clause'),
-  {license: 'BSD-2-Clause'}
-)
-
-assert.throws(function () {
-  // An invalid SPDX license expression.
-  // Should be `Apache-2.0`.
-  parse('Apache 2')
-})
-
-assert.deepEqual(
-  // Dual licensed under either:
-  // - LGPL 2.1
-  // - a combination of Three-Clause BSD and MIT
-  parse('(LGPL-2.1 OR BSD-3-Clause AND MIT)'),
-  {
-    left: {license: 'LGPL-2.1'},
-    conjunction: 'or',
-    right: {
-      left: {license: 'BSD-3-Clause'},
-      conjunction: 'and',
-      right: {license: 'MIT'}
-    }
-  }
-)
-```
-
-The syntax comes from the [Software Package Data eXchange (SPDX)](https://spdx.org/), a standard from the [Linux Foundation](https://www.linuxfoundation.org) for shareable data about software package license terms.  SPDX aims to make sharing and auditing license data easy, especially for users of open-source software.
-
-The bulk of the SPDX standard describes syntax and semantics of XML metadata files.  This package implements two lightweight, plain-text components of that larger standard:
-
-1.  The [license list](https://spdx.org/licenses), a mapping from specific string identifiers, like `Apache-2.0`, to standard form license texts and bolt-on license exceptions.  The [spdx-license-ids](https://www.npmjs.com/package/spdx-license-ids) and [spdx-exceptions](https://www.npmjs.com/package/spdx-exceptions) packages implement the license list.  `spdx-expression-parse` depends on and `require()`s them.
-
-    Any license identifier from the license list is a valid license expression:
-
-    ```javascript
-    var identifiers = []
-      .concat(require('spdx-license-ids'))
-      .concat(require('spdx-license-ids/deprecated'))
-
-    identifiers.forEach(function (id) {
-      assert.deepEqual(parse(id), {license: id})
-    })
-    ```
-
-    So is any license identifier `WITH` a standardized license exception:
-
-    ```javascript
-    identifiers.forEach(function (id) {
-      require('spdx-exceptions').forEach(function (e) {
-        assert.deepEqual(
-          parse(id + ' WITH ' + e),
-          {license: id, exception: e}
-        )
-      })
-    })
-    ```
-
-2.  The license expression language, for describing simple and complex license terms, like `MIT` for MIT-licensed and `(GPL-2.0 OR Apache-2.0)` for dual-licensing under GPL 2.0 and Apache 2.0.  `spdx-expression-parse` itself implements license expression language, exporting a parser.
-
-    ```javascript
-    assert.deepEqual(
-      // Licensed under a combination of:
-      // - the MIT License AND
-      // - a combination of:
-      //   - LGPL 2.1 (or a later version) AND
-      //   - Three-Clause BSD
-      parse('(MIT AND (LGPL-2.1+ AND BSD-3-Clause))'),
-      {
-        left: {license: 'MIT'},
-        conjunction: 'and',
-        right: {
-          left: {license: 'LGPL-2.1', plus: true},
-          conjunction: 'and',
-          right: {license: 'BSD-3-Clause'}
-        }
-      }
-    )
-    ```
-
-The Linux Foundation and its contributors license the SPDX standard under the terms of [the Creative Commons Attribution License 3.0 Unported (SPDX: "CC-BY-3.0")](http://spdx.org/licenses/CC-BY-3.0).  "SPDX" is a United States federally registered trademark of the Linux Foundation.  The authors of this package license their work under the terms of the MIT License.